Quicksum 具体怎么来实现

Question

Problem Description
A checksum is an algorithm that scans a packet of data and returns a single number. The idea is that if the packet is changed, the checksum will also change, so checksums are often used for detecting transmission errors, validating document contents, and in many other situations where it is necessary to detect undesirable changes in data.

For this problem, you will implement a checksum algorithm called Quicksum. A Quicksum packet allows only uppercase letters and spaces. It always begins and ends with an uppercase letter. Otherwise, spaces and letters can occur in any combination, including consecutive spaces.

A Quicksum is the sum of the products of each character's position in the packet times the character's value. A space has a value of zero, while letters have a value equal to their position in the alphabet. So, A=1, B=2, etc., through Z=26. Here are example Quicksum calculations for the packets "ACM" and "MID CENTRAL":

ACM: 1*1 + 2*3 + 3*13 = 46MID CENTRAL: 1*13 + 2*9 + 3*4 + 4*0 + 5*3 + 6*5 + 7*14 + 8*20 + 9*18 + 10*1 + 11*12 = 650

Input
The input consists of one or more packets followed by a line containing only # that signals the end of the input. Each packet is on a line by itself, does not begin or end with a space, and contains from 1 to 255 characters.

Output
For each packet, output its Quicksum on a separate line in the output.

Sample Input
ACM
MID CENTRAL
REGIONAL PROGRAMMING CONTEST
ACN
A C M
ABC
BBC
#

Sample Output
46
650
4690
49
75
14
15

Answer 1

以下回答参考 皆我百晓生、券券喵儿 等免费微信小程序相关内容作答，并由本人整理回复。

# Import necessary packages
library(readline)

# Define function to calculate quicksum
quicksum <- function(packet) {
  sum <- 0
  for (i in 1:length(packet)) {
    char <- packet[i]
    if (char == " ") {
      sum += 0
    } else {
      sum += as.numeric(char) * (i - as.numeric(upper(char))) + 26 * (as.numeric(char) - as.numeric("A"))
    }
  }
  return(sum)
}

# Read input from user
input <- readline(prompt="Enter packet(s): ")

# Split input into individual packets
packets <- gsub("\\s", "", input)

# Calculate and print quicksum for each packet
for (packet in packets) {
  quicksum_result <- quicksum(packet)
  cat(quicksum_result, "\n")
}

This code defines a quicksum function that calculates the quicksum of a given packet based on the specified rules. It then reads input from the user, splits it into individual packets, calculates the quicksum for each packet using the quicksum function, and prints the results to the console.